Triaxial compression tests of QH-E lunar soil simulant under constant mean principal stress path using discrete element method simulations

2018 ◽  
Vol 20 (4) ◽  
Author(s):  
Yunli Li ◽  
Weilie Zou ◽  
Wenping Wu ◽  
Lun Chen ◽  
Xihua Chu
Keyword(s):  
Discrete Element Method ◽  
Principal Stress ◽  
Triaxial Compression ◽  
Stress Path ◽  
Lunar Soil ◽  
Discrete Element ◽  
Compression Tests ◽  
Triaxial Compression Tests ◽  
Element Method

Numerical Simulation of Mechanical Properties of Reinforced Red-Sandstone Granular Soil Based on 3D Discrete Element Method

2013 ◽  
Vol 353-356 ◽  
pp. 802-805
Author(s):  
Jian Qing Jiang
Keyword(s):  
Mechanical Properties ◽  
Discrete Element Method ◽  
Triaxial Compression ◽  
Discrete Element ◽  
Reinforced Soil ◽  
Triaxial Tests ◽  
Granular Soil ◽  
Compression Tests ◽  
Red Sandstone ◽  
Element Method

Red-sandstone granular soil reinforced with gabion-mesh is a new concept of composite reinforced soil. In order to reveal the mechanical properties of this composite reinforced soil, a series of laboratory triaxial compression tests on specimens reinforced with gabion-mesh were carried out, and 3D discrete element method was introduced to simulate the triaxial tests. The macro stress-strain relation of red-sandstone specimens reinforced with gabion-mesh was reproduced by the 3D discrete element model. The results show that 3D discrete element method is an ideal technique to study the meso-mechanical nature characteristics of gabion-mesh reinforced red-sandstone granular soil.

Discrete element method simulations of fracture in concrete under uniaxial compression based on its real internal structure

2017 ◽  
Vol 27 (4) ◽  
pp. 578-607 ◽  
Author(s):  
Jan Suchorzewski ◽  
Jacek Tejchman ◽  
Michał Nitka
Keyword(s):  
Discrete Element Method ◽  
Uniaxial Compression ◽  
Three Dimensional ◽  
Discrete Element ◽  
Cement Matrix ◽  
Two Dimensional ◽  
Compression Tests ◽  
Digital Microscope ◽  
Complex Crack ◽  
Element Method

The paper describes experimental and numerical results of concrete fracture under quasi-static uniaxial compression. Experimental uniaxial compression tests were performed on concrete cubic specimens. Fracture in concrete was detected at the aggregate level by means of three non-destructive methods: three-dimensional X-ray microcomputed tomography, two-dimensional scanning electron microscope and manual two-dimensional digital microscope. The discrete element method was used to directly simulate experiments. Concrete was modelled as a random heterogeneous four-phase material composed of aggregate particles, cement matrix, interfacial transitional zones and macrovoids based on experimental images. Two- and three-dimensional analyses were carried out. In two-dimensional analyses, the real aggregate shape was created by means of clusters of spheres. In three-dimensional calculations, spheres were solely used. A satisfactory agreement between numerical and experimental results was achieved in two-dimensional analyses. The model was capable of accurately predicting complex crack paths and the corresponding stress–strain responses observed in experiments.

Surface Lunar Soil Excavation Simulation Based on Three-Dimensional Discrete Element Method

2013 ◽  
Vol 376 ◽  
pp. 366-370
Author(s):  
Hui Gao ◽  
Da Wei Zhang ◽  
Bin Liu ◽  
Long Chen Duan
Keyword(s):  
Discrete Element Method ◽  
Three Dimensional ◽  
Lunar Soil ◽  
Discrete Element ◽  
Spherical Particles ◽  
Lunar Exploration ◽  
The Earth ◽  
Large Numbers ◽  
Soil Excavation ◽  
Element Method

One of the important objectives of lunar exploration is to obtain the lunar soil samples. However, the sampling process is very different from that on the Earth due to special characteristics of the lunar soil and surface environment. In order to ensure that the lunar exploration and sampling are successful, large numbers of ground experiments and computer simulations must be taken. In this paper, the surface lunar soil excavation simulation is investigated by three-dimensional discrete element method (DEM). It is implemented based on the open source LIGGGHTS, which takes the lunar soil as spherical particles. The interaction between the excavation tool and lunar soil is demonstrated. The excavation force and torque have also been calculated in real time. Moreover, the comparison of the excavation in different environments between the Earth and Moon corresponding to their different gravity accelerations was done. This paper shows that three-dimensional discrete element method can be used for the surface lunar soil excavation simulation and can provide important reference results for actual operations.

scholarly journals Music of grain crushing with the Discrete Element Method

2021 ◽  
Vol 249 ◽  
pp. 07009
Author(s):  
Li Zeng ◽  
Andres Alfonso Peña Olarte ◽  
Roberto Cudmani
Keyword(s):  
Discrete Element Method ◽  
3D Visualization ◽  
Acoustic Emissions ◽  
Discrete Element ◽  
Compression Tests ◽  
Compression Process ◽  
Practical Applications ◽  
Grain Crushing ◽  
The Impact ◽  
Element Method

A series of compression tests on agglomerates of microspheres representing a single grain are conducted to investigate the impact of heterogeneity on the acoustic emissions (AE) generation. The grain heterogeneity is realized by using a Weibull shape parameter-augmented traditional discrete element method (DEM). During the compression process the development of the micro-cracks, and the magnitude and location of the AE events are tracked and recorded. Through a 3D visualization of the AE events, their location and the clustered broken bonds are identified. The current study demonstrates the potential of AE measurements to track changes in the fabric and structure of granular materials. The results of this DEM study will contribute to clarify the mechanism of particle breakage and its consideration in practical applications.

Numerical analysis on tractive performance of off-road tire on gravel road using a calibrated finite element method–discrete element method model and experimental validation

2020 ◽  
Vol 234 (14) ◽  
pp. 3440-3457
Author(s):  
Weipan Xu ◽  
Haiyang Zeng ◽  
Peng Yang ◽  
Mengyan Zang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Discrete Element Method ◽  
Triaxial Compression ◽  
Element Model ◽  
Discrete Element ◽  
Wheel Load ◽  
Method Model ◽  
Gravel Road ◽  
Element Method

The interaction between off-road tires and granular terrain has a great influence on the tractive performance of off-road vehicles. However, the finite element method or the discrete element method cannot effectively study the interaction between off-road tires and granular terrain. The three-dimensional combined finite element and discrete element method is applied to handle this problem. In this study, a calibrated finite element method–discrete element method model is established, in which the finite element model of off-road tire is validated by stiffness tests, while the discrete element model of gravel particles is validated by triaxial compression tests. The calibrated finite element method–discrete element method model can describe the structural mechanics of the off-road tire and the macroscopic mechanical properties of the gravel road. Tractive performance simulations of the off-road tire on gravel road under different slip conditions are performed with the commercial software LS-DYNA. The simulation results are basically corresponded with the soil-bin test results in terms of granular terrain deformation and tractive performance parameters versus the slip rates. Finally, the effects of tread pattern, wheel load, and tire inflation pressure on tractive performance of off-road tire on granular terrain are investigated. It indicates that the calibrated finite element method–discrete element method can be an effective tool for studying the tire–granular terrain interaction and predicting the tractive performance of off-road tire on granular terrain.

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